Click the Exhibit button. Connections between hosts connected to Leaf-1 and Leaf-2 are not working correctly. Referring to the exhibit, which two configuration changes are required to solve the problem? (Choose two.)
Correct Answer: B,C
Question 27
Exhibit. A VXLAN tunnel has been created between leaf1and Ieaf2 in your data center. Referring to the exhibit, which statement is correct?
Correct Answer: C
* Understanding VXLAN Tunneling: * VXLAN (Virtual Extensible LAN) is a network virtualization technology that addresses the scalability issues associated with traditional VLANs. VXLAN encapsulates Ethernet frames in UDP, allowing Layer 2 connectivity to extend across Layer 3 networks. * Each VXLAN network is identified by a unique VXLAN Network Identifier (VNI). In this exhibit, we have two VNIs, 5100 and 5200, assigned to the VXLAN tunnels between leaf1 and leaf2. * Network Setup Details: * Leaf1:Connected to Server1 with VLAN ID 100 and associated with VNI 5100. * Leaf2:Connected to Server2 with VLAN ID 200 and associated with VNI 5200. * Spine:Acts as the interconnect between leaf switches. * Traffic Flow Analysis: * When traffic is sent from Server1 to Server2, it is initially tagged with VLAN ID 100 on leaf1. * The traffic is encapsulated into a VXLAN packet with VNI 5100 on leaf1. * The packet is then sent across the network (via the spine) to leaf2. * On leaf2, the VXLAN header is removed, and the original Ethernet frame is decapsulated. * Leaf2 will then associate this traffic with VLAN ID 200 before forwarding it to Server2. * Correct Interpretation of the Exhibit: * The traffic originating from Server1, which is tagged with VLAN ID 100, will be encapsulated into VXLAN and transmitted to leaf2. * Upon arrival at leaf2, it will be decapsulated, and since it is associated with VNI 5200 on leaf2, the traffic will be retagged with VLAN ID 200. * Therefore, the traffic will reach Server2 tagged with VLAN ID 200, which matches the network configuration shown in the exhibit. * Data Center References: * This configuration is typical in data centers using VXLAN for network virtualization. It allows isolated Layer 2 segments (VLANs) to be stretched across Layer 3 boundaries while maintaining distinct VLAN IDs at each site. * This approach is efficient for scaling large data center networks while avoiding VLAN ID exhaustion and enabling easier segmentation. In summary, the correct behavior, as per the exhibit and the detailed explanation, is that traffic sent from Server1 will be tagged with VLAN ID 200 when it reaches Server2 via leaf2. This ensures proper traffic segmentation and handling across the VXLAN-enabled data center network.
Question 28
You are asked to implement VXLAN group-based policies (GBPs) in your data center. Which two statements are correct in (his scenario? (Choose two.)
Correct Answer: B,C
* VXLAN Group-Based Policies (GBP): * VXLAN Group-Based Policies are used to apply security policies consistently across the network. These policies are often tied to user or device identities rather than static IP addresses, which allows for more dynamic and scalable security management. * Scalable Group Tags via RADIUS and 802.1X: * Option B:VXLAN GBP can use scalable group tags configured on a RADIUS server, which are then pushed to network devices through 802.1X. This allows for centralized and automated policy application based on user or device identity. * Consistent Security Policy Application: * Option C:GBP ensures that security policies are consistently applied across the network, regardless of where a user or device connects. This consistency is crucial in environments where security policies must follow the user or device. Conclusion: * Option B:Correct-Group tags can be configured on a RADIUS server and pushed via 802.1X, enabling centralized policy management. * Option C:Correct-GBP ensures consistent application of security policies, which is essential for maintaining security across a dynamic network environment.
Question 29
Exhibit. Referring to the exhibit, when Host A sends an ARP request for Host B's IP address, which Junos feature does leaf1 require to send an ARP response back to Host A without having to send a broadcast frame over the fabric?
Correct Answer: A
* Scenario Overview: * In the exhibit, Host A is trying to resolve Host B's IP address (10.10.1.2) through ARP (Address Resolution Protocol). Normally, an ARP request would be broadcasted over the network, and the host owning the IP address (Host B) would respond. * Role of Proxy ARP: * Option A:Proxy ARPallows a router or switch (in this case, leaf1) to respond to ARP requests on behalf of another host. Leaf1, knowing the MAC address of Host B through the EVPN MAC advertisement, can reply to Host A's ARP request directly without broadcasting the request across the entire network fabric. This feature reduces unnecessary traffic and increases network efficiency. Conclusion: * Option A:Correct-Proxy ARP enables leaf1 to respond to Host A's ARP request for Host B's IP without broadcasting over the IP fabric, thus providing the ARP response locally.
Question 30
Whatare two ways in which an EVPN-signaled VXLAN is different from a multicast-signaled VXLAN? (Choose two.)
Correct Answer: B,C
* Multicast-Signaled VXLAN: * In traditional multicast-signaled VXLAN, VTEPs (VXLAN Tunnel Endpoints) use multicast to flood and learn about remote VTEPs. This method relies on multicast in the underlay network to distribute BUM (Broadcast, Unknown unicast, and Multicast) traffic. * This approach can be resource-intensive due to the need for multicast group management and increased network traffic, especially in large deployments. * EVPN-Signaled VXLAN: * EVPN-signaled VXLAN uses BGP (Border Gateway Protocol) to signal the presence of VTEPs and distribute MAC address information. BGP is used for VTEP autodiscovery and the distribution of endpoint information. * This method is more efficient because it reduces the reliance on multicast, instead using BGP control-plane signaling to handle VTEP discovery and MAC learning, which reduces the overhead on the network and improves scalability. * Correct Statements: * B. An EVPN-signaled VXLAN can perform autodiscovery of VTEPs using BGP:This is correct because EVPN uses BGP for VTEP autodiscovery, making it more efficient and scalable compared to multicast-based methods. * C. An EVPN-signaled VXLAN is less resource-intensive:This is correct because it eliminates the need for multicast flooding in the underlay, instead using BGP for signaling, which is less demanding on network resources. * Incorrect Statements: * A. An EVPN-signaled VXLAN can perform autodiscovery of VTEPs using IS-IS:This is incorrect because EVPN relies on BGP, not IS-IS, for VTEP discovery and signaling. * D. An EVPN-signaled VXLAN features slower and more complete convergence:This is incorrect; EVPN with BGP typically provides faster convergence due to its use of a control plane rather than relying on data plane learning. Data Center References: * EVPN-VXLAN is widely adopted in modern data center designs due to its scalability, efficiency, and reduced resource consumption compared to multicast-based VXLAN solutions. It leverages the strengths of BGP for control-plane-driven operations, resulting in more efficient and scalable networks.
